Battery-charging system



` F. f- STARR BATTERY CHARGING- SYSTEM Feb.` 9 1926.

Filed March 13, 1922 Patented Feb. 9. ieee,

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Applicationv 81M arch 1 combustionr engine, is connected with a dy- :camo electric. machine adapted to operate either 'a generator or to charge a storage batte y"orasa' motor to crank the engine 15 when the'fdy'namo receives current from the battery.

Inbatte'ry charging systems of this class various devicesv hays been employed for-disn continuing the battery charging when s hat tery' has been fully cA ai ged., and this invention relates more particu orly to that class of battery charging systems in which the cpci'ation of the engine isautoniatically dis continued; when the battery has attained a, given voltage. It is well known in battery' charging systems of this type, that the bettery voltage which corresponds to a full charge at normal temperatures does not cor respond to a fullbattery charge at temperatures belownormal. For instance7 when the battery being charged is at e temperature below normal, it has a higher resistance end for this reason it requires e higher voltage to fully' charge the battery.

lt is an object of this invention to provide cattery charging systems wherein the battere will be fully charged irrespective of the'temperatureV at which the charging takes lace. P A :fuit-her object is to provide a battery charging system of this type-having means responsivelto charging E. ME F. for auto.

ymatically discontinuing the operation oi' the vengine said means being controlled by temrature so thatr the charging voltage may csrriedto a. higher value in cold weather Warm; I @ther and urth 4descripti.on of an embodiment tliereo,

on relates to electrical hat? er objects of the presentA n will' be apparent from the :t'ollow- 3,; issie. semi mi. 543,135.

reference being had to the drawings, in which:

The figure of the drawing is a diagramv niaticvview of en electrical storage battery charging system embodying the invention.

Referring to the drawings 20 designates a dynamo electric machine supplyin current through the battery circuit 21, 22 fgdr charging the storage battery 23. Dynamo 20 may be operated either :is a motor o r a generator, and is herein shown directly connected with an internal-combustion engine 24h A storting switch 25 connected in the battery circuit and includes a magnet having-ii series winding 2S and a shunt winding 27, and an armature 28 carrying contact 29 adapted 'to engage Contact 30 to close the battery'cir-- cuit.

To start the engine 24 4armature 28 is moved to close the contacts 29 and 30. Current iroin the battery 23 then flows throu h the battery circuit 21, 22 and operates tie dyiieino'electric machine 2O as a motor to ydrive the engine. When the engine becomes self-operative the dynamo electric machine 2O operatesas a generator to supply current to the battery 23. The windings 26 and 27 of the starting switch are -so arranged that when current is being supplied from the battery to. operate 20 as a motor, the will oppose one another and the contacts 2 and 30 will not be closed unless the armature 28 is manually retained in circuit closing position. When dynamo 2O operates as a generao'or` windings 26 and 27 will operate cumulatively. to holdv the armature 28 in its raised position and thereby maint-ain the batteryy circuit closed at contacts 29 and 30.

Armature 28 in its circuit closing position also engages contact 31 and thereby serves to connect across the battery charging circuit the ignition cut-out relay 32 which will be now described.l Relay 32 includes an L- shaped frame' of magnetic material carryingA a, magnet core 34, and; an armature 35 in electrical circuit with said frame 33 and pivoted thereon so as to cooperate with the magnet 'core 34'. Mounted on one arm of the frame 33 and insulated therefrom is a loi-metal contact memberV 36 adapted to co- 100.

accompanying operate with an adjustable contact 37 carried by the armature 35. 7The contacts 36 and 37 are held normally1 closed by a spring member 38 as shown. Mounted on the magnet core 34 is a winding'39 which at one end .is grounded on the frame 33 and at the other end is connected by wire 40 with contact 31. Frame 33 is connected by wire 41 with wire 2l of the battery circuit. Coil 39 of thbifutout relay is thus connected across "the hat* tery circuit in the following manner; from one side 21 of the battery circuit through wire 4l,frame 33, winding 39, wire. 40, and contact 3] through the armature 28 to the,1 opposite side 22 oi the batterycircuit, The lil-metal contact 36 is connected with the timer 42 and the primary winding 44 of the ignition coil 43 as shown, the secondary winding 45 being connected with the spark plug 46. The primary of the ignition circuit is then established across the battery circuit from wire 21 through wire 41, frame 33, armature 35.' contact 37 bimetal contact 36, timer 42,the primary 44, and con-. tact 31 through the armature 28 to the other side 22 of the 'battery circuit. The loi-metal contact 36 is made-of' two metals having different coeiiicients of expansion, and is so arranged that. ala-decreasing temperaturesthe contact 36 tends to move away from contact 37, which, by the action of thespring 3B Y is caused to keep the contact 36 .remaining always in contact therewith. It thus appears that with decreasing temperatures contact36 and 37 move in such direction as tot increase the air` ,gapv between vthe magnet core 34 and the armature 35.- With this increased air gap it will require a higher voltage across the winding 39 of the cut-out relay: to actuate the armature 35 and cut 'oil the ignition to stop the engine.

When the battery is being charged the operation of the cut-out relay and the igmtion circuit is as follows: Current flows through the winding 39 of the cut-out relay but this current will not be suiiicient to actuate the armature 35 to break the ignition circuit at 36, 37 until the voltage across the battery has reached the predetermined value corresponding to a full battery charge. When the battery is charged at a temperature lower than normal the bi-metal contact 36 will tend .to recede from the contact 37 to increase the air gap between the armature 35 and the magnet core 34, and thereby increase the voltage which is necessary across the winding 39 to actuate the armature 35l as previously described. The bi-metal contact 36 is so arranged that the voltage lrequired-to interrupt the ignition Icircut at' 36, 37 is substantiallyr the same as the 'voltage which corresponds to ay full battory charge at dierent temperatures of operation.

As soon as the ignition circuit is interlstorage battery `embodiment. of one form of the invention, itis to be understood that other Aforms might be ado tedand various changes and alter- 'ations' made in the shape, size. and propor- -tion of the elements therein without departing from the spirit and scope of the inven- What is claimed is asfollows:

`1. In a battery charging system, the combine-tion withan .internal-combustion engine and a generator driven therebv; of a and means for automaticall; disconnectin the storage battery -from t e has en attained, said means including temperature responsive means permitting the attery voltage. to reach relatively higher values as the temperature decreases.

2. In a battery, charging systcm, the combination with an internal-combustion engine and a generator driven thereby; of a storage battery disconnecting the storage battery from the .gnerator when a certain battery voltage has en attained, said 'ineens including 4a magnet responsive to battery voltage, an 'armature actuated by said magnet and temperature `responsive means for varying the air tgap between the magnet and armature therenerator w en a certain battery voltage and means for automaticallyy permitting the battery voltageto reach' relatively higher values as the temperature decreases.

bination with an internal-combustion' engine and a generator driven thereby; ci electrical engine ignition means; a storage battery; a reverse current relay connecting the battery and generator; and voltage controlled means controlling the ignition means to stop the engine upon the attainment of a certain battery voltage, said means including'temperatnre responsive means permitting the battery voltage to reach relatively higher values as the temperature decreases.

4. In a battery charging system, the combination with an internal-combusticn cngine and a generator driven thereby; of electrical'engine ignition means; a storage battery; a reverse current relay -connecting the battery and generator; voltage controlled means controlling the ignition means to stop the engine upon the attainment of'v '3. In a battery charging system, the comlll,

l. lli.-

sive means for Varyingl the entre,

gap between the magnet and armature thereby permlttin the battery Voltage to reach relatively higher 1 means-for 'so modifying the influence of the magnet on the armature as to permit the `battery voltage to reach relatively higher Values as the temperature decreases. 6. In a battery charging system, die eenibination lWith an internatl-combustion engine and'a generator driven thereby; of a eterA age battery; -and means 'for automatically disconnecting the storage battery Vfrom tbe generator when a certain battery voltage has: been'attained, said means including a net, an armature adapted to be actuated by tbe magnetV 4and temperature responsive means including a lei-metallic member for so modifying the inliuenee et tbe magnet on the armature as t0 permit the battery' voltage to reach relatively higher values as the temperature decreases.

7. ln a battery charging system., tbe coinbination with an internal-combustion engine and a generator driven thereby; of a storage battery; and means for automatically disconnecting the storage battery from tbe generator when a certain battery volta-gre has been attained,v said means includinga magnet responsive tobattery Voltage7 an arma ture adapted to be actuated by said magnet o .varying the air ,een b-A and temperature riesponsive me: 1? f^ a moi-'able eten t r the armature to l and armature tiereby l witzige to reach relaxt the tcinneratm'e 5l. ln a baitery charging' systen'i, the com innation with a prune mover and a generator driven thereby; ot an electrical l tely adapted -to be ell "red by the genera and means for aatrn acally d'iseonnei, .A tbe etora battery from the generator wb o a. certain battery "voltage has been ataine(`I` said ineens including pair of cooper;

contacts in Said control eireuit adap be nio'v d to open or closed position means for normaily holding said contacts in one oli said positie; means includingA meer for moving" tion, and ten prime 

